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  <div class="section" id="id1">
<h1>缓存驱动器<a class="headerlink" href="#id1" title="永久链接至标题">¶</a></h1>
<p>CodeIgniter 提供了几种最常用的快速缓存的封装，除了基于文件的缓存，
其他的缓存都需要对服务器进行特殊的配置，如果配置不正确，将会抛出
一个致命错误异常（Fatal Exception）。</p>
<div class="contents local topic" id="contents">
<ul class="simple">
<li><a class="reference internal" href="#id2" id="id6">使用示例</a></li>
<li><a class="reference internal" href="#id3" id="id7">类参考</a></li>
<li><a class="reference internal" href="#id4" id="id8">驱动器</a><ul>
<li><a class="reference internal" href="#php-apc" id="id9">可选 PHP 缓存（APC）</a></li>
<li><a class="reference internal" href="#id5" id="id10">基于文件的缓存</a></li>
<li><a class="reference internal" href="#memcached" id="id11">Memcached 缓存</a></li>
<li><a class="reference internal" href="#wincache" id="id12">WinCache 缓存</a></li>
<li><a class="reference internal" href="#redis" id="id13">Redis 缓存</a></li>
<li><a class="reference internal" href="#dummy-cache" id="id14">虚拟缓存（Dummy Cache）</a></li>
</ul>
</li>
</ul>
</div>
<div class="custom-index container"></div><div class="section" id="id2">
<h2><a class="toc-backref" href="#id6">使用示例</a><a class="headerlink" href="#id2" title="永久链接至标题">¶</a></h2>
<p>下面的示例代码用于加载缓存驱动器，使用 <a class="reference external" href="#alternative-php-cache-apc-caching">APC</a> 作为缓存，如果 APC 在服务器环境下不可用，将降级到基于文件的缓存。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;adapter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;apc&#39;</span><span class="p">,</span> <span class="s1">&#39;backup&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;file&#39;</span><span class="p">));</span>

<span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$foo</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">))</span>
<span class="p">{</span>
    <span class="k">echo</span> <span class="s1">&#39;Saving to the cache!&lt;br /&gt;&#39;</span><span class="p">;</span>
    <span class="nv">$foo</span> <span class="o">=</span> <span class="s1">&#39;foobarbaz!&#39;</span><span class="p">;</span>

    <span class="c1">// Save into the cache for 5 minutes</span>
    <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="nv">$foo</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span>
<span class="p">}</span>

<span class="k">echo</span> <span class="nv">$foo</span><span class="p">;</span>
</pre></div>
</div>
<p>你也可以设置 <strong>key_prefix</strong> 参数来给缓存名添加前缀，当你在同一个环境下运行多个应用时，它可以避免冲突。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">,</span>
    <span class="k">array</span><span class="p">(</span><span class="s1">&#39;adapter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;apc&#39;</span><span class="p">,</span> <span class="s1">&#39;backup&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;file&#39;</span><span class="p">,</span> <span class="s1">&#39;key_prefix&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;my_&#39;</span><span class="p">)</span>
<span class="p">);</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">);</span> <span class="c1">// Will get the cache entry named &#39;my_foo&#39;</span>
</pre></div>
</div>
</div>
<div class="section" id="id3">
<h2><a class="toc-backref" href="#id7">类参考</a><a class="headerlink" href="#id3" title="永久链接至标题">¶</a></h2>
<dl class="class">
<dt id="CI_Cache">
<em class="property">class </em><tt class="descname">CI_Cache</tt><a class="headerlink" href="#CI_Cache" title="永久链接至目标">¶</a></dt>
<dd><dl class="method">
<dt id="CI_Cache::is_supported">
<tt class="descname">is_supported</tt><big>(</big><em>$driver</em><big>)</big><a class="headerlink" href="#CI_Cache::is_supported" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">参数:</th><td class="field-body"><ul class="first simple">
<li><strong>$driver</strong> (<em>string</em>) -- the name of the caching driver</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">返回:</th><td class="field-body"><p class="first">TRUE if supported, FALSE if not</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">返回类型:</th><td class="field-body"><p class="first last">bool</p>
</td>
</tr>
</tbody>
</table>
<p>当使用 <tt class="docutils literal"><span class="pre">$this-&gt;cache-&gt;get()</span></tt> 方法来访问驱动器时该方法会被自动调用，但是，如果你使用了某些个人的驱动器，
应该先调用该方法确保这个驱动器在服务器环境下是否被支持。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">is_supported</span><span class="p">())</span>
<span class="p">{</span>
    <span class="k">if</span> <span class="p">(</span><span class="nv">$data</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;my_cache&#39;</span><span class="p">))</span>
    <span class="p">{</span>
        <span class="c1">// do things.</span>
    <span class="p">}</span>
<span class="p">}</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Cache::get">
<tt class="descname">get</tt><big>(</big><em>$id</em><big>)</big><a class="headerlink" href="#CI_Cache::get" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">参数:</th><td class="field-body"><ul class="first simple">
<li><strong>$id</strong> (<em>string</em>) -- Cache item name</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">返回:</th><td class="field-body"><p class="first">Item value or FALSE if not found</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">返回类型:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>该方法用于从缓存中获取一项条目，如果获取的条目不存在，方法返回 FALSE 。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$foo</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;my_cached_item&#39;</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Cache::save">
<tt class="descname">save</tt><big>(</big><em>$id</em>, <em>$data</em><span class="optional">[</span>, <em>$ttl = 60</em><span class="optional">[</span>, <em>$raw = FALSE</em><span class="optional">]</span><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Cache::save" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">参数:</th><td class="field-body"><ul class="first simple">
<li><strong>$id</strong> (<em>string</em>) -- Cache item name</li>
<li><strong>$data</strong> (<em>mixed</em>) -- the data to save</li>
<li><strong>$ttl</strong> (<em>int</em>) -- Time To Live, in seconds (default 60)</li>
<li><strong>$raw</strong> (<em>bool</em>) -- Whether to store the raw value</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">返回:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">返回类型:</th><td class="field-body"><p class="first last">string</p>
</td>
</tr>
</tbody>
</table>
<p>该方法用于将一项条目保存到缓存中，如果保存失败，方法返回 FALSE 。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;cache_item_id&#39;</span><span class="p">,</span> <span class="s1">&#39;data_to_cache&#39;</span><span class="p">);</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">注解</p>
<p class="last">参数 <tt class="docutils literal"><span class="pre">$raw</span></tt> 只有在使用 APC 和 Memcache 缓存时才有用，
它用于 <tt class="docutils literal"><span class="pre">increment()</span></tt> 和 <tt class="docutils literal"><span class="pre">decrement()</span></tt> 方法。</p>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Cache::delete">
<tt class="descname">delete</tt><big>(</big><em>$id</em><big>)</big><a class="headerlink" href="#CI_Cache::delete" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">参数:</th><td class="field-body"><ul class="first simple">
<li><strong>$id</strong> (<em>string</em>) -- name of cached item</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">返回:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">返回类型:</th><td class="field-body"><p class="first last">bool</p>
</td>
</tr>
</tbody>
</table>
<p>该方法用于从缓存中删除一项指定条目，如果删除失败，方法返回 FALSE 。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">delete</span><span class="p">(</span><span class="s1">&#39;cache_item_id&#39;</span><span class="p">);</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Cache::increment">
<tt class="descname">increment</tt><big>(</big><em>$id</em><span class="optional">[</span>, <em>$offset = 1</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Cache::increment" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">参数:</th><td class="field-body"><ul class="first simple">
<li><strong>$id</strong> (<em>string</em>) -- Cache ID</li>
<li><strong>$offset</strong> (<em>int</em>) -- Step/value to add</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">返回:</th><td class="field-body"><p class="first">New value on success, FALSE on failure</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">返回类型:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>对缓存中的值执行原子自增操作。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="c1">// &#39;iterator&#39; has a value of 2</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">increment</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 3</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">increment</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">,</span> <span class="mi">3</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 6</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Cache::decrement">
<tt class="descname">decrement</tt><big>(</big><em>$id</em><span class="optional">[</span>, <em>$offset = 1</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#CI_Cache::decrement" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">参数:</th><td class="field-body"><ul class="first simple">
<li><strong>$id</strong> (<em>string</em>) -- Cache ID</li>
<li><strong>$offset</strong> (<em>int</em>) -- Step/value to reduce by</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">返回:</th><td class="field-body"><p class="first">New value on success, FALSE on failure</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">返回类型:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>对缓存中的值执行原子自减操作。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="c1">// &#39;iterator&#39; has a value of 6</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">decrement</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 5</span>

<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">decrement</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 3</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Cache::clean">
<tt class="descname">clean</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Cache::clean" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">返回:</th><td class="field-body">TRUE on success, FALSE on failure</td>
</tr>
<tr class="field-even field"><th class="field-name">返回类型:</th><td class="field-body">bool</td>
</tr>
</tbody>
</table>
<p>该方法用于清空整个缓存，如果清空失败，方法返回 FALSE 。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">clean</span><span class="p">();</span>
</pre></div>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Cache::cache_info">
<tt class="descname">cache_info</tt><big>(</big><big>)</big><a class="headerlink" href="#CI_Cache::cache_info" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">返回:</th><td class="field-body">Information on the entire cache database</td>
</tr>
<tr class="field-even field"><th class="field-name">返回类型:</th><td class="field-body">mixed</td>
</tr>
</tbody>
</table>
<p>该方法返回整个缓存的信息。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nb">var_dump</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">cache_info</span><span class="p">());</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">注解</p>
<p class="last">返回的信息以及数据结构取决于使用的缓存驱动器。</p>
</div>
</dd></dl>

<dl class="method">
<dt id="CI_Cache::get_metadata">
<tt class="descname">get_metadata</tt><big>(</big><em>$id</em><big>)</big><a class="headerlink" href="#CI_Cache::get_metadata" title="永久链接至目标">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">参数:</th><td class="field-body"><ul class="first simple">
<li><strong>$id</strong> (<em>string</em>) -- Cache item name</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">返回:</th><td class="field-body"><p class="first">Metadata for the cached item</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">返回类型:</th><td class="field-body"><p class="first last">mixed</p>
</td>
</tr>
</tbody>
</table>
<p>该方法用于获取缓存中某个指定条目的详细信息。</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nb">var_dump</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get_metadata</span><span class="p">(</span><span class="s1">&#39;my_cached_item&#39;</span><span class="p">));</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">注解</p>
<p class="last">返回的信息以及数据结构取决于使用的缓存驱动器。</p>
</div>
</dd></dl>

</dd></dl>

</div>
<div class="section" id="id4">
<h2><a class="toc-backref" href="#id8">驱动器</a><a class="headerlink" href="#id4" title="永久链接至标题">¶</a></h2>
<div class="section" id="php-apc">
<h3><a class="toc-backref" href="#id9">可选 PHP 缓存（APC）</a><a class="headerlink" href="#php-apc" title="永久链接至标题">¶</a></h3>
<p>上述所有方法都可以直接使用，而不用在加载驱动器时指定 adapter 参数，如下所示:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
</pre></div>
</div>
<p>关于 APC 的更多信息，请参阅 <a class="reference external" href="http://php.net/apc">http://php.net/apc</a></p>
</div>
<div class="section" id="id5">
<h3><a class="toc-backref" href="#id10">基于文件的缓存</a><a class="headerlink" href="#id5" title="永久链接至标题">¶</a></h3>
<p>和输出类的缓存不同的是，基于文件的缓存支持只缓存视图的某一部分。使用这个缓存时要注意，
确保对你的应用程序进行基准测试，因为当磁盘 I/O 频繁时可能对缓存有负面影响。</p>
<p>上述所有方法都可以直接使用，而不用在加载驱动器时指定 adapter 参数，如下所示:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">file</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
</pre></div>
</div>
</div>
<div class="section" id="memcached">
<h3><a class="toc-backref" href="#id11">Memcached 缓存</a><a class="headerlink" href="#memcached" title="永久链接至标题">¶</a></h3>
<p>可以在 memcached.php 配置文件中指定多个 Memcached 服务器，配置文件位于
<em>application/config/</em> 目录。</p>
<p>上述所有方法都可以直接使用，而不用在加载驱动器时指定 adapter 参数，如下所示:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">memcached</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
</pre></div>
</div>
<p>关于 Memcached 的更多信息，请参阅 <a class="reference external" href="http://php.net/memcached">http://php.net/memcached</a></p>
</div>
<div class="section" id="wincache">
<h3><a class="toc-backref" href="#id12">WinCache 缓存</a><a class="headerlink" href="#wincache" title="永久链接至标题">¶</a></h3>
<p>在 Windows 下，你还可以使用 WinCache 缓存。</p>
<p>上述所有方法都可以直接使用，而不用在加载驱动器时指定 adapter 参数，如下所示:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">wincache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
</pre></div>
</div>
<p>关于 WinCache 的更多信息，请参阅 <a class="reference external" href="http://php.net/wincache">http://php.net/wincache</a></p>
</div>
<div class="section" id="redis">
<h3><a class="toc-backref" href="#id13">Redis 缓存</a><a class="headerlink" href="#redis" title="永久链接至标题">¶</a></h3>
<p>Redis 是一个在内存中以键值形式存储数据的缓存，使用 LRU（最近最少使用算法）缓存模式，
要使用它，你需要先安装 <a class="reference external" href="https://github.com/phpredis/phpredis">Redis 服务器和 phpredis 扩展</a> 。</p>
<p>连接 Redis 服务器的配置信息必须保存到 application/config/redis.php 文件中，可用参数有:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;socket_type&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;tcp&#39;</span><span class="p">;</span> <span class="c1">//`tcp` or `unix`</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;socket&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/var/run/redis.sock&#39;</span><span class="p">;</span> <span class="c1">// in case of `unix` socket type</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;host&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;127.0.0.1&#39;</span><span class="p">;</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;password&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">NULL</span><span class="p">;</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;port&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">6379</span><span class="p">;</span>
<span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;timeout&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
</pre></div>
</div>
<p>上述所有方法都可以直接使用，而不用在加载驱动器时指定 adapter 参数，如下所示:</p>
<div class="highlight-ci"><div class="highlight"><pre><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">redis</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
</pre></div>
</div>
<p>关于 Redis 的更多信息，请参阅 <a class="reference external" href="http://redis.io">http://redis.io</a></p>
</div>
<div class="section" id="dummy-cache">
<h3><a class="toc-backref" href="#id14">虚拟缓存（Dummy Cache）</a><a class="headerlink" href="#dummy-cache" title="永久链接至标题">¶</a></h3>
<p>这是一个永远不会命中的缓存，它不存储数据，但是它允许你在当使用的缓存在你的环境下不被支持时，
仍然保留使用缓存的代码。</p>
</div>
</div>
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